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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jul. 01, 2024
Dec. 31, 2023
Jul. 01, 2023
Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]                
Percentage of Loans Related to Single Industry on Loans 10.00%   10.00%     10.00%    
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans 81.10%   81.10%     83.00%    
Loans and Leases Receivable, Related Parties $ 274   $ 274     $ 292   $ 547
Loans held for investment $ 21,146,033   $ 21,146,033     $ 20,352,559    
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate 0.40%   0.40%     0.34%    
Loans and leases receivable, nonaccrual loans $ 84,000   $ 84,000     $ 68,700    
Financing Receivable, Allowance for Credit Losses on Loans $ 354,400   $ 354,400     $ 332,400    
Allowance for Credit Losses as Percentage of Loans 1.58%   1.58%     1.57%    
Provision for credit losses     $ 7,923 $ 11,984        
Provision for credit losses $ 0 $ 0 9,066 18,540        
Increase in allowance for credit losses for loans     $ 22,000          
Increase in allowance for credit losses for loans, percentage     6.60%          
Net charge-offs 5,455 3,408 $ 11,966 18,858        
General reserve 5,000   13,900          
Allowance for credit losses on off-balance sheet credit exposures 37,646 $ 36,503 37,646 $ 36,503 $ 37,646 $ 36,503 $ 36,503 $ 29,947
Commitments expected to fund 1,850,000   1,850,000          
Nonaccrual loans 83,969   83,969     68,688    
LSSB Merger [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Provision for credit losses 7,900              
Net charge-offs     26,100          
Troubled Debt Restructuring [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Allowance for credit losses on off-balance sheet credit exposures 37,600   37,600     36,500    
Troubled Debt Restructuring [Member] | LSSB Merger [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Provision for credit losses 1,200              
PCD Loans [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Net charge-offs 1,400   3,300          
Nonperforming Financial Instruments [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Loans held for investment $ 89,900   $ 89,900     $ 72,700